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Brother DR420 Imaging Drum Overview:
When purchasing a printer, comparing the cost of the consumables should always be a factor. Lets take a good at the DR420 imaging drum cartridge. The DR420 fits in a number of monochrome (black & white) printers and yields up to 12,000 pages under optimal conditions. Although this may seem like a lot of pages, when compared to other drums, this is just an average to low lifespan. The matching toner (Brother TN450 Toner) yields up to 2,600 pages and will get replaced 4-5 times before the DR420 requires replacing. This is a good toner to drum ratio, especially when compared to some of the bigger machines that are a 1 to 1 ratio.

Brother DR420 Pricing:
This is where the DR420 really shines. Compared to other drum models, the Brother DR420 is rather inexpensive. Some Brother Drum models cost as much as $250, so the $84.99 price is rather reasonable. The low page yield and reasonable price will appeal to the lower to moderate user that do not want to break the bank every time the drum needs replacing. The cost goes down even further if you purchase the compatible drum for only $57.99.

Sum It All Up
The Brother DR420 is a low costing drum that will fit the smaller budgets. It has a decent lifespan and a good toner to drum replacement ratio. This drum is a good fit for the average to moderate user that wants to keep a little extra change in their pockets.

To understand how a laserjet printer prints is to understand the basics of electrical charges like static electricity. This is how a laserjet printer makes a powder toner adhere to a piece of paper. The first thing is to understand the opposites attract. This is how magnets work, positive charges are attracted to and stick to negative charges.
To explain this in basic terms:

1. The printer puts a negative charge on the paper.
3. The printer’s laser spreads a negative electrostatic image onto a positively charged drum (reversing the polarity only where the image is)
2. The drum roller with the negatively charged image rolls over the positively charged toner, picking the toner on the image only (opposites attract).
3. The paper is then feed to the fuser unit where hot rollers heat up the paper and press the toner onto the paper. Since the toner is partly made up of plastic, the plastic melts and gets pressed to the paper making it adhere permanently.
4. The finished product is rolled out.